Iscar 3800128 Threading Toolholder Internal Rh Solid Carbide

Product Description

The ISCAR 3800128 is an internal, right-hand indexable threading toolholder from the IscarThread series, designed for precision thread-cutting operations on CNC lathes and turning centers. Built from solid carbide, the toolholder features a 0.62 x 0.62 inch square shank and an overall length of 5.0 inches. A minimum bore diameter of 0.47 inches allows access to small-diameter internal bores. The insert is secured by screw clamping, providing rigid, repeatable positioning during threading passes. This toolholder is installed by machinists and CNC operators in production and job-shop environments.

The 3800128 is suited for internal threading applications on a range of thread forms. The SI-style toolholder head measures 1.0 inch in length, with a neck diameter of 0.38 inches and a center-to-cutting-edge dimension of 0.26 inches. The shank length is 4.0 inches. This configuration fits boring bar-style setups where reach and rigidity into a bore are critical. Compatible inserts span a wide range of thread profiles, making this holder useful across diverse production threading tasks in metalworking operations.

Key Features

• Solid carbide construction for rigidity and vibration damping in small-bore internal threading
• Right-hand cut, SI-style toolholder head for standard CNC lathe and turning center setups
• Screw-clamp insert holding method ensures secure, repeatable insert positioning
• Accepts IR/L-series inserts covering UN, NPT, NPTF, ISO, MJ, UNJ, BSPT, PG, W, and ABUT thread forms
• Minimum bore diameter of 0.47 inches enables threading in tight internal features
• No coolant-through design — standard dry or flood coolant setups apply

Compatibility

Compatible with IR/L-series inserts to 55, IR/L to 60, IR/L to ABUT, IR/L to BSPT, IR/L to ISO, IR/L to MJ, IR/L to NPT, IR/L to NPTF, IR/L to PG, IR/L to UN, IR/L to UNJ, and IR/L to W thread profiles as specified in the IscarThread series.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Power down the machine and engage all safety interlocks before changing or setting toolholders. Verify shank seating and screw-clamp torque per the machine tool manufacturer's tooling specification before running a threading cycle. Confirm minimum bore clearance against the 0.47-inch minimum bore diameter before programming the toolpath.